As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 7836 - FAR-ORD - DURING TAKEOFF, AIRCRAFT RETURNED TO FAR AFTER DECLARING AN EMERGENCY DUE TO STAB TRIM AND MACH TRIM EICAS MESSAGE FAILURE ON BOTH CHANNELS. MAINTENANCE RERACKED HSTCU AND CYCLED C/B'S OPS CHECK GOOD. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)